Earth-auger



(No Model.)

M. S. FRANKS.

EARTH AUGER.

No. 471,605. Paten-ted Mar. 29, 1892.

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UNITED STATES PATENT OFFICE.

MADISON S. FRANKS, OF ALEXANDER, TEXAS.

"EARTH-AUG ER.

SPECIFICATION forming part of Letters Patent No. 471,605, dated March 29, 1892 Application filed November 27,1891. Serial No. 413,235. (No model.)

To aZZ whom it may concern:

Be it known that I, MADISON S. FRANKS, a citizen of the United States, residing at Alexander, in the county of Erath and State of Texas, have invented certain new and useful Improvements in Earth-Angers; and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to an implement designed for boring earth, and may be used for well-boring and also for boring post-holes.

The invention will be fully understood from the following description and claim, when taken in connection with the annexed drawings, in which:-

Figure 1 isa side elevation of the improved auger or earth-boring device. Fig. 2 is a longitndinal sectional view taken in the plane indicated by the dotted line y y on Fig. 1. Fig. 3 is a plan view of the blank from which the device is formed with a portion of the stem broken away. Fig. 4 is a view of the point, and Fig. 5 is a cross-sectional view taken through the blade at the point indicated by the dotted line w on on Fig. 1.

In carrying out my invention I take a bar of iron or other suitable material of a sufficient length, and if rectangular in cross-section I flatten out a sufficient portion thereof to form the blade, as shown at a, the stem 1) being preferably of angular form in cross-section to receive a cross-bar or handle, as will be presently described. I then slit the lower end of the flattened blade on opposite sides of the center, as shown at 0, so as to form an entering point B, which projects below the lower edge of the blade, as shown. The blade is then given an abrupt twist, so as to form the two sets of spirals d, and the outer edges of these spirals are twisted suficiently upward and inward to draw the auger into the earth after it has been started. The outer edges of these spiral twists are beveled, as

shown at e in Fig. 5, so as to serve as a cutting-edge in reaming out ahole formed by the lower cutting-edgesf.

It should be observed thatthe edges j of the blade are formed into cutters andtwisted so as to form a hole in the earth beginning from the entering point B, while the outer edges of the blade serve to ream out the hole from the point left off by said cuttersf. It should also be observed that the twist at the lower end of the blade will assist in drawing the auger as it cuts into the earth or soil and thereby require but little pressure from the operator. .It will also be observed that the lower ends of the blade are beveled, as shown at g, and merge into the parallel sides oredges b.

A indicates across-bar or handle, which may be formed from metal, wood, or other suitable material and provided'with an eye, as shown, to receive the shank or stem 1) of the auger, and the handle carries a set-screw h, whereby said handle may be adjustably secured upon the stem or shank.

With a device of this character very hard earth may be bored into, and owing to the peculiar formation of the augerI am enabled to bore equally as well in sand or gravel.

Having described my invention, what I claim isp The earth-auger described, formed from a single piece ofmetal flattened at one end and slitted at a, so as to form the entering point B, and having the edges f of the slitted portion formed into cutters, said blade being also beveled on its longitudinal edges and tapered at c, the whole being twisted to form abrupt spirals, substantially as specified.

In testimony whereof I affix my signature in presence of two witnesses.

MADISON S. FRANKS.

Witnesses:

O. C. OLIVER, T. B. SIMMONS. 

